By PaperPatrika | New Delhi/GangtokContentsIntroductionHow Did the Disaster Occur?Was Methane Gas the Main Cause?Why Did the Tunnel Collapse?Why Was the Rescue Operation So Difficult?Casualties and Rescue EffortsGovernment and NHPC ResponseWhy Are Himalayan Tunnel Projects So Risky?Lessons for India’s Infrastructure SectorInvestigation UnderwayConclusion Introduction A devastating accident at the under-construction NHPC Teesta Stage-VI Hydroelectric Project in Namchi … Continue reading What Caused the NHPC Tunnel Disaster in Sikkim’s Namchi? Methane Gas Explosion, Landslide, and Fragile Himalayan Geology Explained